Making stencils.



J. H, LANGROUK.

MAKING STENCIL?) APPLICATION FILED JAIL 18, 1913 LMQS UU5 Patented July7, 191%.

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JOSEPH H. :LANGROCK, or NEW YORK, u. ASSIGNOR 'IO'LANGROCK BROS.COMPANY, A CORPORATlON or NEW YORK.

MAKING STENCILS.

Specification of Letters Patent.

Patented July 7, 1914."

Application filed January 18, 191s:- Serial No. 742,972.

To all whom it may concern Be it known that I, Josnrrr H. Lanenooic, acitizenof the United States, and a resident of the borough of Brooklyn,city of New York, county of Kings, and State of New Y0rk,'have inventedcertain newand useful Improvementsin the Making of Stencils, of whichthefollowing is a specification.

My invention relates to a stencil. the base of which is a foraminousfabric, such for instance as that known'as organdie or muslin, theinterstices in which are' filled up more or less, in whole or'in part,with an insoluble I pigment which representsthe negative portion of thedesign to be reproduced.

The accompanying drawing is a diagram matic' representation of a stencilmade in accordance with my invention, the size of the mesh beingnecessarily increased for clearness of illustration.

' In making my stencil I first stretch a base B, of organdie .or muslinor other suitable foraminous fabric upon a frame F, which holds thematerial. taut and facilitatesmanipulation. For convenience 1' hereindesig- Hate the faceof the stencil fabric as that outside the frame, andthe back of the fab ric as that within the frame. I thenapply t0 theface of the stencil fabric a layer or coating of pigmentary. vehicle P,say for instance a mixture of approximately seventy five per cent. ofzinc oxid, zinc white, or a suitable paint or pigment, with twenty-fiveper. cent. ofa suitable varnish drier, al-. though I do not limit myselfto any pan ticular pigment or filler norto any particular vehicle, norto the proportions thereof, the essential feature in this respect beingthe use of suitable-filling material in conjunction with a vehicle whichis also what is technically 'known as a drier. The next step is toscrape off the excess .of pigmentill vehicle from the face of thefabric, which operation necessarily'forces more or less of thematerialthrough the mesh to the back.

of the fabric. This protrusion of the mate rial through the mesh isscraped off, and the evenly coated 'stencilflbase is then subjected to adamp heat until half dry -or suflicientlyso to facilitate themanipulation to follow. A positive or relief design block or plate isused to effect the desired displacement and disposition of thepigniental filling material Within and upon the fabric. This block mayconsist of a manually enand consequently the clear portions of the.

print to be obtained therefrom. Previous to use theface of this reliefblock is covered with a zinc or other suitable powder the excess ofwhichis wiped or brushed office."- ing the raised portions of the design freeand smooth, but filling the depressedportions ftliefdesi n with thepowder. The face of the half dry stencil fabric is applied to the faceof the design blockin such mannor that the raised or positive portionso1" the design force the pigmcntal vehicle through the mesh. The back ofthe fabric 15 then scraped by the use of 'a thin, flexible blade, withtheresult that. while the material forced through the meshby thepositive portions of the design is removed, leaving such portions of themesh free and clear,

- filling material'is also forced back through the portions of the meshoverlying thc depressed portions of the design and into contact with thepowder therein contained,

I whichpowder, or the greater portion there- .of, is taken up andassimilated bythepigmental vehicle thus forced through the mesh, andbecomes a component part there- 1 of. The stencil fabric after suchtreatment isrem'ovedj from the design block and dried, the resultingstencil showing the negatlve or filled portions of the mesh in slightly.raised relief upon the face of the stencil, .with. the interveningportions of the'mesh clear and unobstructed for the passage of the paintor other marking materialtorepresent the positive portions of the printto be obtained from the stencil.

the design on the thereof the stencil is an advantage in that itspacesthe stencil more or less away from the surface to be printed uponsothat even the more delicate and inp This protrusion ofzthe filled orvnegative portions 01V trieate portions of the design are insured anadequate quantity or layer of paint, ink or other printing vehicle.Incidentally'the use of the powder on the design block facilitates theremoval of the stencil therefrom, but the more .important function ofthe powder is to unite with the pigmental vehicle forced into thedepressed portions of nous fabric with a pigmentary vehicle,-re

moving the excess of such vehicle from one side of the fabric andforcing portions thereof through the meshes to the other side of thefabric removing such forced-through portions, su jecting the stencilbase to a damp heat, and applying the face of the fabric to a reliefdesign surface and forcing by the raised portions thereof the pigmentaryvehicle through the mesh of the fabric to the other side thereof andfinally removing the excess of such pigmentary vehicle.

2. The process of making stencils herein set forth, consisting in casinga taut foraminous fabric with a pigmental vehicle,

and back of the fabric, applying the face ofthe latter to a-reliefdesign block or plate the depressed portions of whi ch contain a powderadapted to assimilate with such manner that the raised portions of thedesign force the pigmental vehicle through the mesh to the back thereof,removing the excess of pigmental material from the back and forcing aportion of it through the mesh and into the depressed portions of thedesign surface, whereby a relief stencil is formed substantially asherein set forth.

3. The herein described process of making stencils, which consists incoating a foramimoving the excess of such vehicle from one thereofthrough the meshes to the other side portions, and applying the face ofthe fab ric to a relief design surface and forcing by the raisedportions thereof the pigmentary vehicle through the mesh of the fabricto the; excess of such pigmentary vehicle.

J OSEPH H. LANGROCK.

NVitnesses:

G120. WM. MIATT, LILLIA MIATT.

the pigznental vehicle, applying pressure in side of the fabric andforcing portions removing the excess thereof from the face nous fabricwith a pigmentary vehicle, ie-

of the fabric, removing such forced-through the other side thereof andfinally removing

